Advertisements
Advertisements
प्रश्न
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Advertisements
उत्तर
(a) Its atomic number is 3.
(b) Mass no. = 3 + 4 = 7
\[{\underset{2}{\text{ K }}\underset{8}{\text{ L }}}\]
(c) Electronic configuration is(d) Element E is a metal because in order to complete its octet, the element loses 1 electron from its outermost orbit and attains a stable configuration with 2 electrons in its first shell. Elements which lose electrons to attain stability are called metals.
(e) A Cation will be formed by an atom of element A because its outermost single electron can be easily donated.
(f) E+
(g) Element X is lithium.
APPEARS IN
संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
Write the names of the elements present in the:-
Sodium hydroxide
Write the names of the elements present in the:-
Acetic acid
State Dalton’s atomic theory.
Name the particle or particles you would expect to find in :
The nucleus of an atom
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
How is the size of an atom indicated ?
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
What is the contribution of the following in atomic structure?
Maharshi Kanada
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
Define the following term with an example.
Element
Name the sub-atomic particles.
Draw the structure of an atom and explain the position of the sub-atomic particles.
Which of the following statements made by Dalton has not undergone any change?
______ is the smallest particle of an element.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
The smallest unit of an element is ______.
